Session Initiation Protocol - Protocol Handler (SIP PH)
Considerations
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Overview
This section discusses the engineering considerations for the SIP
protocol handler (PH).
Capacity
When SIP signaling uses precondition procedures and is supported by
the SCTP transport layer, as in the base SIP for Packet Trunking
feature, the SIP PH can process approximately 350K calls per hour,
with a small number of associations terminated on the SIP PH. When
SIP signaling operates without precondition procedures and with the
UDP transport layer, the capacity is considerably reduced.
The SIP PH supports one full duplex 100BaseT Ethernet link. The
link can support approximately 2.65 million calls per hour depending
on the average message size, however, the overall engineered capacity
is primarily limited by the processor capacity of the SIP PH.
Configuration
requirements
Table 4-6, “SIP PH Configuration” (4-9) illustrates the engineering
configurations required to support a SIP PH.
Table 4-6 SIP PH Configuration
SM Global SM-2000
Terminations single full duplex PHE2 Ethernet Link
PSU Type PSU2 equipped with DF2
PH Hardware TN13 with an LLE2 100BaseT
Ethernet Paddle board
SIP PHs can only be provisioned in PSU 0 if a dual-PSU
configuration exists on a SIP GSM. There are no constraints on
coexistence with other types of protocol handlers aside from the
number of physical circuit pack slots available in the PSU2 shelf.
Recommendations
SIP PHs in the same processor group should be assigned to different
power buses and fuse groups, if possible. Refer to PSU2
“Recommendations” (4-6) for additional detail.
It is recommended, for reliability purposes, to engineer the SIP PH
processor groups as duplex (i.e., each processor group has a pair of
SIP PHs). As a duplex processor group, one SIP PH acts as the
serving SIP PH and the other acts as the non-serving SIP PH.
Engineering Considerations
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235-200-118
Issue 3.02B, March 2007
Lucent Technologies
4-9
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